BAEL-2304 Improve webflux original article

- Added snippets for spring reactive functional tutorial

spring-5-reactive-security/src/main/java/com/baeldung/reactive/functional/EmployeeFunctionalConfig.java

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+package com.baeldung.reactive.functional;
+
+import static org.springframework.web.reactive.function.BodyExtractors.toMono;
+import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
+import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
+import static org.springframework.web.reactive.function.server.RouterFunctions.route;
+import static org.springframework.web.reactive.function.server.ServerResponse.ok;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.web.server.ServerHttpSecurity;
+import org.springframework.security.web.server.SecurityWebFilterChain;
+import org.springframework.web.reactive.function.server.RouterFunction;
+import org.springframework.web.reactive.function.server.ServerResponse;
+
+import com.baeldung.webflux.Employee;
+import com.baeldung.webflux.EmployeeRepository;
+
+@Configuration
+public class EmployeeFunctionalConfig {
+
+    @Bean
+    EmployeeRepository employeeRepository() {
+        return new EmployeeRepository();
+    }
+
+    @Bean
+    RouterFunction<ServerResponse> getAllEmployeesRoute() {
+      return route(GET("/employees"), 
+        req -> ok().body(
+          employeeRepository().findAllEmployees(), Employee.class));
+    }
+
+    @Bean
+    RouterFunction<ServerResponse> getEmployeeByIdRoute() {
+      return route(GET("/employees/{id}"), 
+        req -> ok().body(
+          employeeRepository().findEmployeeById(req.pathVariable("id")), Employee.class));
+    }
+
+    @Bean
+    RouterFunction<ServerResponse> updateEmployee() {
+      return route(POST("/employees/update"), 
+        req -> req.body(toMono(Employee.class))
+                  .doOnNext(employeeRepository()::updateEmployee)
+                  .then(ok().build()));
+    }
+
+    @Bean
+    RouterFunction<ServerResponse> composedRoutes() {
+      return 
+          route(GET("/employees"), 
+            req -> ok().body(
+              employeeRepository().findAllEmployees(), Employee.class))
+            
+          .and(route(GET("/employees/{id}"), 
+            req -> ok().body(
+              employeeRepository().findEmployeeById(req.pathVariable("id")), Employee.class)))
+            
+          .and(route(POST("/employees/update"), 
+            req -> req.body(toMono(Employee.class))
+                      .doOnNext(employeeRepository()::updateEmployee)
+                      .then(ok().build())));
+    }
+
+    @Bean
+    public SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http) {
+        http.csrf()
+            .disable()
+            .authorizeExchange()
+            .anyExchange()
+            .permitAll();
+        return http.build();
+    }
+}

spring-5-reactive-security/src/main/java/com/baeldung/reactive/functional/EmployeeSpringFunctionalApplication.java

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+package com.baeldung.reactive.functional;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class EmployeeSpringFunctionalApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(EmployeeSpringFunctionalApplication.class, args);
+    }
+
+}

spring-5-reactive-security/src/test/java/com/baeldung/reactive/functional/EmployeeSpringFunctionalIntegrationTest.java

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+package com.baeldung.reactive.functional;
+
+import org.junit.Test;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import com.baeldung.webflux.Employee;
+
+public class EmployeeSpringFunctionalIntegrationTest {
+
+    private static EmployeeFunctionalConfig config = new EmployeeFunctionalConfig();
+
+    @Test
+    public void givenEmployeeId_whenGetEmployeeById_thenCorrectEmployee() {
+        WebTestClient client = WebTestClient
+            .bindToRouterFunction(config.getEmployeeByIdRoute())
+            .build();
+
+        Employee expected = new Employee("1", "Employee 1");
+
+        client.get()
+            .uri("/employees/1")
+            .exchange()
+            .expectStatus()
+            .isOk()
+            .expectBody(Employee.class)
+            .isEqualTo(expected);
+    }
+}